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-   -   The Kuartlotron - keantoken's simple error-correction superbuffer (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer.html)

ApolloZhang 12th March 2017 12:09 PM

Hi Kean,

thanks for your reply. It's a pity that it cant be implemented this way, but given the size of Kuartlotron perhaps i can parallel some of them to drive a Moving-coil headphone;)

keantoken 12th March 2017 12:22 PM

If you can push at least 1mW it may be good enough, even if you can't push 1V into the worst-case load of 16 ohms.

BRN 4th April 2017 05:26 PM

I'm about to start building my next Kuartlotron buffer preamp and was thinking of using a 50k step attenuator with the buffer and wanted to know if is made sense to change the 100k resistor to a 50k? Is there any benefit or will 100k work fine?

Destroyer OS 4th April 2017 08:56 PM

I don't think there is any reason to change it.

BRN 4th April 2017 10:26 PM

Quote:

Originally Posted by Destroyer OS (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer-post5041127.html#post5041127)
I don't think there is any reason to change it.

Destroyer,

Thanks. That's what I was thinking as well. I purchased 2 eBay DACT attenuators this time, one 50k and the other 100k. I'm not sure that either will make a difference, but thought I would try the 50k.

The other changes are to build the buffer with 2 RJM S-regs, which is a shunt-series voltage regulator for low current audio circuits, instead of the onboard shunts.

Destroyer OS 5th April 2017 05:33 AM

I use 10k with no issues, if that helps. The most important thing is to finish it and enjoy!

The circuit isn't fussy in the least. It's actually probably one of the most adaptable buffers around. I've run multiple amps off of each channel, and had zero issues with sources or volume devices. It just sounds great.

BRN 5th April 2017 01:31 PM

Destroyer OS,

Thank you. Not sure which value attenuator I will go with. My phono preamp just likes to see something over 25k. I will probably add a second set of output for my sub and see if it sounds better than the high level input.

Brad

AndrewT 5th April 2017 01:43 PM

Quote:

Originally Posted by BRN (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer-post5041780.html#post5041780)
Destroyer OS,

Thank you. Not sure which value attenuator I will go with. My phono preamp just likes to see something over 25k. I will probably add a second set of output for my sub and see if it sounds better than the high level input.

Brad

If the pre is showing symptoms of struggling with less than 25k, then you shopuld be looking at what a bit of cable capacitance is doing to performance.
Invest in a Buffer on the output of your pre so that is can drive a cable and the next stage.

RCruz 20th April 2017 03:29 PM

Hi Anthony

I am going to use your kuartlotron buffers in my new preamp.
These buffers will be used for the tape recording output so they will be connected directly in parallel with the preamps inputs.

These inputs are also connected to the volume pot and to the DCG3 preamp from Salas.

Now, the pot has 50k ohm
DCG3 has 300k input impedance
I would like to increase the kuartlotron input impedance to minimize it's inpact on the overall input impedance for the preamp.

Can I increase R8 to 500k without having issues with the offset ?

Should I also include a series resistor in the input to avoid interactions between the two circuits connected in parallel ?

I am working on the layout I will post later to clear any doubts about the connections.

RCruz 20th April 2017 03:56 PM

1 Attachment(s)
This is what I have in mind:


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